Development of Manufacturing Process for High Residual magnetic flux density of Magnet powders Pellets Used by Anisotropyic Plastic-Bonded Magnet

摘要

The present study is related to magnet pellet made using the anisotropic metal mold and has improve the characteristic of the magnetic particle of hard ferrite or rare-earth magnet. This hard ferrite magnetic particles or rare earth magnetic particles is crystallized in a direction of crystal axis (C-axis) so that it may have the aspect ratio of the length of the crystal axis to the diameter of crystal lattice plate of 1.0 or more. These anisotropic magnetic particles have high magnetic energy. These anisotropic magnetic particles kneaded with a thermoplastic resin or a thermosetting resin, and then pelletized. Then, the pellets are injection-molded or compression-molded using a metal mold for the anisotropic plastic magnet. The anisotropic magnets have high magnetic energy with the effect of the high magnetic energy of the anisotropic magnetic particles and nonmagnetic energy of the resin matrix. The anisotropic magnets also can control a high residual magnetic flux density (Br) by selecting the compounding ratio of the matrix resin to the anisotropic magnetic particles.